The following is an excerpt from an article I've posted on this topic.

"I’ve avoided comment on SheerWind and its Invelox device previously—I can’t really call it a wind turbine—because I’ve debunked similar claims for other devices many times before. I only mention SheerWind in passing in my 560-page book on wind energy. I include it in a litany of ducted wind turbine flops that failed to meet Carl Sagan’s skeptic’s credo that “extraordinary claims demand extraordinary proof.” In this case, SheerWind made extraordinary claims, but offered no proof that its Invelox device could do what it promised—and it still doesn’t.

I wouldn’t have bothered looking into it even now until links to news articles about a furor in Denmark were thrown over my digital transom. Denmark? Surely, they know better? And that was why the flap was resonating in both the local and engineering press. Danes were asking how this could happen in the land where modern wind energy was born. Now SheerWind’s design was more than a “industry-changing” or “revolutionary” invention as such hucksters are won’t to call them. It was an international scandal involving so-called “American” technology. "

My inbox saw a flurry of emails 4 January 2018 to inform me that ducted turbine darling SheerWind-Invelox was bankrupt. While the event wasn't much of a surprise, it did take much longer than I'd expected.

While the web site is still live, there has been no activity since August 2017. SheerWind's phone has been disconnected.

In February 2017 I asked Is the End Nigh for Another Ducted Turbine? So, no, I wasn't prescient. I thought they'd be gone by mid-summer when they would fail to meet their contractual obligations to the Michigan National Guard. It's one thing to stiff the Nature Conservancy, but it's quite something else to stiff people with an arsenal of weapons.

Yet it is now official. SheerWind-Invelox is bankrupt with a Chapter 7 filing 29 December 2017. SheerWind will be liquidated. It has zero assets, and liabilities of $3.7 million. Ouch.

. . . SheerWind's liabilities likely don't include the removal of its derelict devices in Minnesota, Michigan, and on Palmyra Atoll in the equatorial Pacific. One of the devices--I don't call them wind turbines--stands forlornly near Chaska, Minnesota. Three of the devices are abandoned at two bases of the Michigan National Guard. One also remains on the Pacific atoll. . .